/Engine/Source/Editor/ProjectTargetPlatformEditor/Public/Interfaces/IProjectTargetPlatformEditorModule.h
Check to see if the given platform is on the list of supported targets, and show a warning message if it's not, allowing the user to continue or cancel
true if the platform is supported, or the warning was accepted with "continue".
bool ShowUnsupportedTargetWarning ( const [FName](API\Runtime\Core\UObject\FName) PlatformName ) const